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Effect of intermittent drought on grain yield and quality of rice (Oryza sativa L.) grown in Rwanda
Journal of Agronomy and Crop Science ( IF 3.5 ) Pub Date : 2019-11-27 , DOI: 10.1111/jac.12380
Alphonsine Mukamuhirwa 1 , Helena Persson Hovmalm 1 , Rodomiro Ortiz 1 , Obedi Nyamangyoku 2 , Maria Luisa Prieto–Linde 1 , Anders Ekholm 1 , Eva Johansson 1
Affiliation  

The climate change will contribute drought and temperature extremes to rice growing systems, especially when cultivated in equatorial regions. To evaluate opportunities to cultivate and breed drought‐tolerant rice, seven rice cultivars were evaluated in Rwanda for recurring morphological drought scores, grain yield and components, and quality characteristics. The cultivation conditions, that is site and drought treatment, impacted morphological drought scores, growth and yield attributes, while cultivar affected quality attributes. Thus, site showed a higher impact on grain yield and components than drought and cultivar, with generally a reduced grain yield at the low‐temperature site, as a result of low spikelet fertility. Morphological drought scores were generally increased by drought, while drought at the reproductive stage at the high‐temperature site was negative for yield and its components. The cultivars “Intsindagirabigega” and “Jyambere” were adapted to high‐temperature site conditions. The cultivar “Intsindagirabigega” had the highest amylose content, and “Mpembuke,” the highest antioxidant capacity. Thus, climate change with increased temperature and drought extremes may increase rice productivity in cool areas, while especially drought at reproductive stage will be detrimental in low altitude areas with high temperature. Cultivar variation indicated opportunities for selection and breeding of climate change tolerant rice cultivars which should be of immediate priority.

中文翻译:

间歇干旱对卢旺达水稻(Oryza sativa L.)产量和品质的影响

气候变化将给水稻种植系统带来干旱和极端温度,特别是在赤道地区种植时。为了评估耐旱水稻的种植和育种机会,在卢旺达对七个水稻品种进行了形态干旱评分,谷物产量和成分以及品质特性的反复评估。栽培条件,即定点干旱处理,影响形态干旱评分,生长和产量属性,而品种影响品质属性。因此,与小穗和栽培品种相比,小穗对籽粒的产量和构成成分的影响更大,由于小穗肥力低,低温部位的籽粒产量通常降低。干旱通常会增加形态干旱分数,而高温地区生殖阶段的干旱对产量及其组成成分不利。品种“ Intsindagirabigega”和“ Jyambere”适应高温现场条件。品种“ Intsindagirabigega”的直链淀粉含量最高,而“ Mpembuke”的抗氧化能力最高。因此,温度升高和极端干旱导致的气候变化可能会增加凉爽地区的稻米产量,而特别是生殖阶段的干旱将对高温低海拔地区造成不利影响。品种差异表明选择和育种耐气候变化水稻品种的机会应立即得到重视。品种“ Intsindagirabigega”的直链淀粉含量最高,而“ Mpembuke”的抗氧化能力最高。因此,温度升高和极端干旱导致的气候变化可能会增加凉爽地区的稻米产量,而特别是生殖阶段的干旱将对高温低海拔地区造成不利影响。品种差异表明选择和育种耐气候变化水稻品种的机会应立即得到重视。品种“ Intsindagirabigega”的直链淀粉含量最高,而“ Mpembuke”的抗氧化能力最高。因此,温度升高和极端干旱导致的气候变化可能会增加凉爽地区的稻米产量,而特别是生殖阶段的干旱将对高温低海拔地区造成不利影响。品种差异表明选择和育种耐气候变化水稻品种的机会应立即得到重视。
更新日期:2019-11-27
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